Method of forming dished laminated articles



March l2, 1940. c, H, HEMPEL-Er AL l 2,193,513 v l vma'lmonm# FORMING DIsHED LAMINATED A'rIcLEs Filed May 4, 19:58 2 sheets-Sheet 1 Patented Mer. iz, 194e e .It 2,193,513` l UNITED ASTATES, PATENT OFFICE Charlesll. Hempel, Edwin C. Schreihart, and

Paul N. Clemens, Manitowoc, Wis., assignors to Heresite Chemical Company, a corporation s of Wisconsin Aspusstisn my 4. 193s. sei-m No. zoaosi comms. (cils-5s) This invention relates to the manufacture of lip 2| and the side portions 22 and the edges of dished laminated articles and particularly to the these portions merge with the corner members formation of inner door panelsl for refrigerators. Il to provide a strong integral and wrinkle-free It has heretofore been impracticable to premember 20. e

pare molded and particularlyv laminated inner The corner members may be preformed by cold door panels for refrigerators without considerable molding any suitable mold powder. for example, wrinkling' and overlapping on account of the a phenol formaldehyde resin under heavy presbending thereof. sure.

In accordance with this invention, unwrixikled For example, a suitable pressure is 600 pounds 1 and structurally uniform panels of this type, or per square inch at atmospheric temperatures. l.-

other similar dished objects, may be prepared The invention may be used in the manufacture from laminated materials with great simplicity. of any formed object of upset shape 'where the The invention is illustrated in the drawings in entire body cannot be given the requisite strength which Fig. i is a perspective view of a completed by using a molding powder alone and where the u 15 panel; Fig. 2 is a plan view of a blank of sheets use of laminated material for the whole object therefor; Fig. 3 is a perspective view of a pre- 'would result in undesirable wrlnkling. form for the corner; Fig. 4 is a sectional view The foregoing detailed description has been through Fig. 2 illustrating the plies of material; given for clearness of understanding only, and Fig.`5 is a plan view of the lower half of the mold no unnecessary limitations should be understood with the parts assembled in it; Fig. 6 is a sectherefrom, but the appended claims should be zo tional elevation along the line 6 in Fig. 5, butwithconstrued as broadly as permissible in view of the' the upper half of the mold in place; and Fig. "l prior art.

is a sectional view along the line 1 in Fig. 3. We claim:

The laminated material for the panel may be 1. The method of forming a dished body, which prepared in any suitable manner employing any comprises preparing a laminated plastic impregsuitable resin. Preferably. the laminations comnated body member adapted to form the bottom prise impregnated or coated pieces of paper, canand sides of said dished device,`said body memvas, fabrics, metals or combinations thereof. The ber being provided with rectangular cut-out pormolding COlIllJOSitillV may be e neutral 0r Syn'- tions at the corners, preparing preformed upset thetic Permanently thermOpleStiCOne, 0r e thel- .corner members from plastic material, and then 30 mOSetting material. en impact molding materiel. molding body and corners together to form an inor other suitable plastic. Preferably, a phenol tegral dished member, formaldehyde type resin is employed. 2. The method t of forming a dished body,

As an example of the invention, a pile of lamiwhich comprises preparing a, laminated plastic usted sheets, for instance 3o sheets of thin teximpregnated body member adapted to form the 35 tile material impregnated with phenol formaldebottom and sides of said dished device, said body hyde resin. aresuperimposed and pressed t0- member being provided withv cut-out portions at gether, preferably under sufficient heat to bring the comers, preparing preformed upset comer the resin approximately into the B stage. The members from plastic material, and then molding corners il of the panel i 2 are thencut out as inbody and comers together to form an .integral 40 dicated in Fig. 2. The panel is placed in a die dished memben I3 in which preformed corner pieces il have previously been set. The corner members are quar- 3' The method of forming a' refrigerator door tered curved members provided with a up l5, a panel with beveled edges and unbroken rounded concave inner face it and a convex outer face comers' which comprises preparing abody mem' 45 I1 shaped to conform to the ultimate corners be? adapted to form the bottom sides and beveled of the paneL v edges of the panel, said body member being pro- These corner members i4 are preferably of unvided with cutout Portions at the immers' prepa!" laminated plastic material -of the same type as ing preformed upset Cornel members from Plas- 50 that used in the panel l2. The panel. l2 is set tic material. and then molding body and corners to overthe mold 25 as indicated in Fig; 5 and then together t0 ferm en integral Panel. the upper portion 26 of the mold is lowered'with heat and pressure as indicated in Fig. 6 to form CHARLES H. the dished member 20 as shown in- Fig. 1. Durt EDWIN C. T.

55 ing this process the panel i2 is upset'to form the s PAUL N. CLmdENBV. 

